## Why
Rolls out the Vertical Pod Autoscaler control plane so the estate can gather right-sizing recommendations for every workload (advise mode, follow-up PR adds the per-workload VPA objects). Deploys the **recommender only**: advise mode never mutates pods, so the updater and admission-controller (and its mutating webhook) are intentionally omitted — fewer moving parts, no webhook in the admission path.
## Changes
- Add `apps/base/vpa-system/`: namespace, VPA CRDs (verticalpodautoscalers + verticalpodautoscalercheckpoints) pulled from the kubernetes/autoscaler repo at the pinned tag (same upstream-raw pattern node-feature-discovery uses), recommender-scoped RBAC (SA + metrics-reader/actor/status-actor/checkpoint-actor/target-reader), and the recommender Deployment.
- Add `apps/overlays/au-syd1/vpa-system/` referencing the base.
- Register `apps/overlays/*/vpa-system` in the platform ApplicationSet.
## Notes
- Pins upstream **vertical-pod-autoscaler-1.7.0** (latest stable, 2026-05-29) for both CRDs and the `registry.k8s.io/autoscaling/vpa-recommender:1.7.0` image.
- No platform AppProject change needed: `*-system` namespace destination plus CustomResourceDefinition/ClusterRole/ClusterRoleBinding are already whitelisted.
- The recommender image is pull-through-cached via terraform-artifactapi PR #13 (merge gate below).
## Merge gate
- Requires terraform-artifactapi PR #13 (adds the `autoscaling/vpa-` pattern to the k8s-registry docker remote) to land first so the recommender image is served through the cache.
Reviewed-on: #281
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>
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